POINT 3 OBS INSTANT PREVIEW PATCH V4

Fixes OBS display delay after Director button click.

What changed:
- Overlay now uses Server-Sent Events: api/overlay_events.php
- Fallback polling reduced to 250ms
- Timer local tick improved to 200ms
- API/browser cache disabled

OBS Browser Source recommended settings:
1. URL: http://localhost/YOUR_FOLDER/overlay.php?t=1
2. Width 1920 / Height 1080
3. Tick: Refresh browser when scene becomes active
4. Untick: Shutdown source when not visible
5. Press Refresh cache of current page after installing patch

Install:
Extract into project root and open:
http://localhost/YOUR_FOLDER/install_innings_timer_stats_patch.php
Then hard refresh Director and OBS Browser Source.